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4. Exposures with filters
The thread of the lens 4 or the lens hood mount takes a screw-in filter:
30.5 x 0.5 for Sonnar lensed models (35S / 35SE)●
24.0 x 0.5 for Tessar lensed models (Original 35 / 35T)●
Filters mostly require an exposure correction. Its value is engraved on the filter mount. This indicates the
number of stops by which the aperture has to be opened (towards lower f/numbers) or the exposure time
increased .
For example if the measured aperture is f/11, and the filter correction value -1.5 ( i.e. 1 l/2 aperture stops),
use an aperture setting between f/8 and f/5.6
If you want to correct by increasing the exposure time, moving the shutter speed dial from one value to
the next corresponds to a full exposure step correction. Half steps can only be allowed for by intermediate
aperture settings.
Filters for black and white shots:
Medium yellow filter: (exposure correction -1.5). This makes the sky reproduce darker, clouds more
brilliant and improves modelling in snow shadows.
Orange filter: (exposure correction -1.5 to -3, according to the film type used). This darkens blue skies to
give heavy thunderstorm effects and lightens yellows and reds.
Filters for colour shots:
Filter UV and colour conversion filter R 1.5: (these require no exposure correction). They subdue blue
casts which can arise on cloudless days through the predominant blue skylight, especially in distant views.
With some reversal colour films a warmer overall rendering may be desirable. In that case the R 1.5 filter
may be used for all shots.
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All this informations, texts, and Images were extracted from the "Rollei 35/35T/35S In Practical Use" and
only intends to give some orientation to new users that didn't had access to the original manual. (c)
Rollei-Werke Franke & Weidecke